The Mexico Institute’s “Weekly News Summary,” released every Friday afternoon, summarizes the week’s most prominent Mexico headlines published in the English-language press, as well as the most engaging opinion pieces by Mexican columnists.

What the English-language press had to say…

This week, auto defensa vigilante groups in the state of Guerrero released the last of the 42 alleged criminals they had kept hostage for almost two months, avoiding a showdown with government authorities. The leader of one such group reported the first casualty since the movement began in early January. Human Rights Watch released a scathing report blaming Mexico’s police and military forces of involvement in several dozen missing person cases. The government pledged to address the issue by, among other things, collecting DNA samples from the families of the disappeared in an effort to match missing persons’ reports with thousands of unidentified corpses found in recent years. In Tamaulipas, an anonymous Facebook and Twitter campaign continued to attract thousands of followers eager to receive unofficial updates on organized crime. International observers drew attention to the lack of safety that journalists working in Mexico face.

A Facebook page in Mexico has notched tens of thousands of followers for posting detailed but unconfirmed updates on security risks in the drug-war hot zone of Tamaulipas state. Now, purported assassins have declared a bounty on the head of the page’s anonymous administrator. In response, the Facebook author said the page would not stop gathering and publishing information on shootouts and highway blockades because the Tamaulipas authorities and local news outlets offer nearly zero updates on so-called “risk situations.”

The person behind Valor por Tamaulipas posted a photograph last week of a reward notice that was said to have begun circulating in several Tamaulipas cities calling for information leading to the page’s author or relatives. The flier makes an offer of 600,000 pesos, or about $47,000, for information and includes a cellphone number with a Tamaulipas area code.